VBA - Modify sheet naming from source file - regex

Question

I received help in the past for an issue regarding grabbing a source file name and naming a newly created worksheet the date from said source file name, i.e. "010117Siemens Hot - Cold Report.xls" and outputting "010117".
However the code only works for file names with this exact format, for example, file named "Siemens Hot - Cold Report 010117.xls", an error occurs because the newly created sheet does not find the date in the source file.
CODE
Application.ScreenUpdating = False
Dim n As Double
Dim wksNew As Excel.Worksheet
Dim src As Workbook
Set src = Workbooks.Open(filePath, False, False)
Dim srcRng As Range
With src.Worksheets("Sheet1")
Set srcRng = .Range(.Range("A1"), .Range("A1").End(xlDown).End(xlToRight))
End With
With ThisWorkbook
Set wksNew = .Worksheets.Add(After:=.Worksheets(.Sheets.Count))
n = .Sheets.Count
.Worksheets(n).Range("A1").Resize(srcRng.Rows.Count, srcRng.Columns.Count).Value = srcRng.Value
End With
' ======= get the digits part from src.Name using a RegEx object =====
' RegEx variables
Dim Reg As Object
Dim RegMatches As Variant
Set Reg = CreateObject("VBScript.RegExp")
With Reg
.Global = True
.IgnoreCase = True
.Pattern = "\d{0,9}" ' Match any set of 0 to 9 digits
End With
Set RegMatches = Reg.Execute(src.Name)
On Error GoTo CloseIt
If RegMatches.Count >= 1 Then ' make sure there is at least 1 match
ThisWorkbook.Worksheets(n).Name = RegMatches(0) ' rename "Sheet2" to the numeric part of the filename
End If
src.Close False
Set src = Nothing
So, my question is, how can I get my code to recognize the string of digits no matter its position in the file name?

Answer 1

Code
^\d{0,9}\B|\b\d{0,9}(?=\.)
Usage
I decided to make a function that can be called inside a cell as such: =GetMyNum(x) where x is a pointer to a cell (i.e. A1).
To get the code below to work:
Open Microsoft Visual Basic for Applications (ALT + F11)
Insert a new module (right click in the Project Pane and select Insert -> Module).
Click Tools -> References and find Microsoft VBScript Regular Expressions 5.5, enable it and click OK
Now copy/paste the following code into the new module:
Option Explicit
Function GetMyNum(Myrange As Range) As String
Dim regEx As New RegExp
Dim strPattern As String
Dim strInput As String
Dim strReplace As String
Dim strOutput As String
Dim match As Object
strPattern = "^\d{0,9}\B|\b\d{0,9}(?=\.)"
If strPattern <> "" Then
strInput = Myrange.Value
With regEx
.Global = True
.MultiLine = True
.IgnoreCase = False
.Pattern = strPattern
End With
If regEx.test(strInput) Then
Set match = regEx.Execute(strInput)
GetMyNum = match.Item(0)
Else
GetMyNum = ""
End If
End If
End Function
Results
Input
A1: Siemens Hot - Cold Report 010117.xls
A2: 010117Siemens Hot - Cold Report.xls
B1: =GetMyNum(A1)
B2: =GetMyNum(A1)
Output
010117 # Contents of B1
010117 # Contents of B2
Explanation
I will explain each regex option separately. You can reorder the options in terms of importance in such a way that the most important option is first and least important is last.
^\d{0,9}\B Match the following
^ Assert position at the start of the line
\d{0,9} Match any digit 0-9 times
\B Ensure position does not match where a word boundary matches (this is used but may be dropped depending on usage - I added it because it seems the number you're trying to get is immediately followed by a word character and not followed by a space - if that's not always the case just remove this token)
\b\d{0,9}(?=\.) Match the following
\b Assert position as a word boundary
\d{0,9} Match any digit 0-9 times
(?=\.) Positive lookahead ensuring a literal dot . follows

Answer 2

Just my alternative solution to RegEx :)
This finds the first occurence of 6 consecutive digits, omitting blanks and periods... although there are probably some more issues with using IsNumeric as I believe a lowercase e is considered acceptable by it...
Sub FindTheNumber()
For i = 1 To Len(Range("A1").Value)
If IsNumeric(Mid(Range("A1").Value, i, 6)) = True And InStr(Mid(Range("A1").Value, i, 6), " ") = 0 And InStr(Mid(Range("A1").Value, i, 6), ".") = 0 Then
MyNumber = Mid(Range("A1").Value, i, 6)
Debug.Print MyNumber
Exit For
End If
Next i
For i = 1 To Len(Range("A2").Value)
If IsNumeric(Mid(Range("A2").Value, i, 6)) = True And InStr(Mid(Range("A2").Value, i, 6), " ") = 0 And InStr(Mid(Range("A2").Value, i, 6), ".") = 0 Then
MyNumber = Mid(Range("A2").Value, i, 6)
Debug.Print MyNumber
Exit For
End If
Next i
End Sub
Examples:
Immediate window: